Eric ZHANG
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Eric ZHANG
the difference reference and copy is as below: ``` a2={"aaa":1};b2={"bbb":2} a1={"a2":a2};b1={"b2":b2} ab={"a":a1,"b":b1} dd=[] dd.append(ab) print(dd) # output is [{'a': {'a2': {'aaa': 1}}, 'b': {'b2': {'bbb': 2}}}] a2["aaa"]=99;b2["bbb"]=99 print(dd) # output...